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Questions and Answers
What does an electromagnetic wave consist of?
Who formulated the electromagnetic theory predicting the nature of visible light?
Which equation refers to the relationship between electric and magnetic fields in electromagnetic waves?
What is the speed of electromagnetic waves in a vacuum?
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What does an electric field represent?
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How are electric and magnetic fields oriented in electromagnetic waves?
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What phenomenon occurs according to Faraday's law of induction?
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What characterizes the magnetic field around a magnet?
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Study Notes
Electromagnetic Waves
- James Clerk Maxwell, in 1865, formulated his electromagnetic theory predicting that visible light is an electric and magnetic phenomena.
- Maxwell's equations predict the relationship between changing magnetic fields and electric fields, and vice versa.
- According to Maxwell, an electromagnetic wave is a disturbance in electric and magnetic fields produced by accelerated charges.
- Electromagnetic waves travel at the speed of light (c = 3.0 x 10⁸ m/s) through empty space.
Features of Electromagnetic Waves
- The electric field is defined as the force per unit charge.
- The direction of the electric field is the same direction as the force on a positive test charge.
- The electric field is radially outward from a positive charge and radially inwards toward a negative charge.
- The magnetic field is the area around a magnet where the magnetic effect is felt.
- Electromagnetic waves have both an electric and magnetic component that are perpendicular to each other.
- The changing electric field and changing magnetic field generate each other.
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Description
Explore the key concepts of electromagnetic waves as formulated by James Clerk Maxwell. This quiz covers the relationship between electric and magnetic fields, the properties of electromagnetic waves, and their propagation speed. Test your knowledge on this fundamental topic in physics!
